Sieving-machine.



J. B. LoIsoN. SIEVING MACHINE. i APPLICATION I'ILBD AUG. 19, 1909. z

, Patented Apr.11,1911.

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J. B. LOISON.

sIEvING MAGHINE.

, APPLICATION FILED AUG. 19, 1909.l

y 989,167. Patented Apr.,11, 1911.

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J. B.Lo1soN. SIEVING MACHINE.

APPLICATION FILED AUGJQ, 1909.

989,167, ,Patented Apr.11,1911.`

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J. B. LOISON.

SIEVING MAGHINB.

APPLIUATION FILED A5116.19, 1909.k

Patented 'Apr'.` 11, 1911.

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JOSEPH :BERNARD LOISON, 0F PARIS, FRANCE.

SIEVING-MACHINE.

Specification of Letters Patent.

Patented Apr. 11, 1911.

Application filed August 19, 1909. Serial No. 513,656.

To all 'whom it may concern:

Be it known that I, JOSEPH BERNARD LoIsoN, a citizen of France, residingat 18 Rue Clapeyron, Paris, France, have invented new and usefulImprovements in Sieving- Machines, of which the following is aspecification.

My invention relates to a sieving machine adapted for use in sifting allkinds of materials the coarseness and hardness of which varyconsiderably, such as flour, sand stone, emery, etc., said sievingmachine being formed of a number of superposed sieves on which thematerial is submitted at the same time to a curvilinear movement socalled plan-sifter motion and to a vertical shaking movement of avariable frequency and extent, the material being at the same timeautomatically spread on the sieves by rotatable brushes. By means of thecurvilinear motion in cooperation with the vertical shaking movementswhich are adapted to disengage the particles of material jammed in. themeshes of the sieves, and the spreading out of the material by thebrushes, results are obtained which it was not possible to get at up tothe present.

My invention consists also in providing a machine adapted to work in acompletelyl enlarging the operating surface and consequently the outputof the machine. Different combinations may also be embodied by mountingin the same machine sieves of the same mesh and sieves having meshes de-.creasing from top to bottom. One single -machine may thus be sufficientfor effecting a great number of operations happening in practice.

In the annexed drawings: Figure 1 is a front view of my improvedmachine, Fig.`

2 is a side view thereof, Fig. 3 is a plan view, Figs. 4c and 5 aredetails of the brushes, in plan view and vertical section, respectively,Fig. 6 is a diagrammatic view showing a number of superposed sieveshaving the same mesh, Fig. 7 is a cross section of the feeding drum.

` My sieving machine comprises a plurality of circular sieves 1 mountedone upon the other and each provided with a wire, silk or other screen 2(Fig. 5) according to the nature of the material to be sifted. Saidsieves are held together by means of side rods 3 a number of which passat upper end through cross bars L (Fig. 8) extending across the circularcover 5 on the sieves. The sieves are mounted in a frame comprisingvertical posts 6, horizontal frames 7, 8 diagonal braces 9 andstiffening plates 10 so as to obtain a very strong and rigid structure.The sieves are supported by two vertical rods 11 and on the lower endsthereof are screwed nuts 12 having a hemispherical head which engages ina corresponding housing in brackets 13 fixed to the lower sieve. Attheir upper ends, the rods 11 are provided with similar nuts 14k whichbear upon swinging levers 15. The levers 15 are pivoted on stud shafts16 (Figs. 1 and 3) and operated by two cams 17 keyed on the drivingshaft 18 having the driving pulleys 19 secured thereon. The ends of thelevers 15 which coperate with the cams are covered with fiber pieces 2Oadapted to reduce thel noise and the wear. Said ends are also hung bybuffer springs 22 to a frame 21 mounted on the frame of the machine.When the levers 15 descend together with the sieves after having beenlifted by the cams, they fall upon screwed studs 23 forming adjustablesto-ps and mounted on brackets 24 secured to the frame of the machine. Acurvilinear movement is` also imparted to the sieves from the drivingshaft 18 through a vertical crank shaft 25 geared to the driving shaftby bevel pinions 26 and rotating in bearings 27. The crank shaft isconnected b a ball or universal joint B to an adjustable connecting rod28 which is secured at one end to a vertical rod 29 fixed at its lowerend to the lower sieve and passing at its upper end through an eye Cmounted on the upper sieve. The crank shaft 25 is also connected at' itslower end by a universal joint 30 to a forked connecting rod 31 (Figs. 1and 3) which is secured at both ends by slides 32 to two rods 3. At apoint 33 diametrically opposite the crank shaft, the lower sieve isconnected by a connecting rod 84 to the frame at 35, so that, in oeration, the point 33 moves along an arc o a circle while the otherpoints o the sieves move in the space along a more or less elongatedellipse, disregarding the vertical shaking movement imparted by the cams17.

The material to be sifted is fed to the machine by a hopper 36 connectedby a hose pipe 37 to a feeding receptacle 38 having a vertical part anda horizontal part extending along a radius of the upper sieve andcontaining a perforated partition 39 (Fig' 8) slightly curved downwardlyand having holes increasing in diameter from the periphery to thecenter. Said feeding receptacle is secured to the cover 5 of the machinewhich is provided with a radial slot for allowing the material to pass.

0n the upper face of each screen 2, are rotated in a step by stepmotion, a series of four rotatable brushes 40 mounted on two elasticarms 41 at right angles to each other, the center part of which is boredfor receiving a vertical rod or shaft 42 adapted to hold all the seriesof brushes together. In the surface of said shaft, are formed a numberof small recesses 48 (Fig. 5) located at a small vertical distance toeach other and adapted to receive the ends of set screws 44 securing thearms 41 to the shaft 42. Each of the screens 2 is perforated at 'thecenter and clamped around the central opening between two metallicsleeves surrounding the shaft 42. On the upper end of the shaft 42 iskeyed a ratchet wheel 45 (Fig. 3) engaging with a pawl 46 pivotallyconnected to an arm 47 .which normally is held stationary but may berotated on shaft 42. The-arm 47 is provided with holes into one of whichengages a rod 48 connected to an upright lever 49 which is pivoted at 50(Fig. 1) on the frame and carries a counter-weight 51 and a clapper 52coacting with a bell 53 secured to the frame. The counterweight 51 has atendency to withstand any movement of the rod 48 and consequently of thearm 47. When oscillating -in the direction indicated by the arrow, thesieves will carry the brushes 40 with them by friction on the screens,while in the oscillating movement of the sieves in the oppositedirection, the brushes will be prevented from turning by the pawl 46engaging the ratchet 45. The brushes consequently will rub on the upperface of each screen and spread the material in a uniform and relativelythin layer. If a screen happens to burst, the brush will be carried withit in its return movement on account of the intervening frictionalresistance, the ratchet will throw back the pawl and with it the arm 47and Vthe rod 48, which will act on the lever 49 to lift thecounterweight 51; the latter, in the followin@ movement in the directionof the arrow, will fall again so that the clapper '52 will cape. Thespouts are provided at their ends with mouth pieces 55 which in a planview (Fig. 8) are arranged in order on a line according to the size ofthe material delivered. Under the mouth pieces, is mounted a baggingtable 56 provided with chutes 57 The mouth pieces are connected to thesechutes by hose pipes 58 provided at their lower ends with a double wall,one envaging into the chute while the other is iXe around it so as toprevent any dust from flowing into the surrounding atmosphere. The bags59 adapted to receive the sifted material are fixed by straps 59 to thelower ends of the chutes 57. Beneath the lower sieve is arranged ahopper 60 (Fig. 1) ending into a hose pipe through which the finestmaterial is collected.

For taking the sieves away from the machine, a crank or handle 62 iskeyed on a horizontal shaft 63 carrying a ratchet 64 provided with aretaining pawl. On the shaft 68 are wound two ropes 65 which may beattached onboth sides of the machine to hooks 66 secured to the uppersieve. For causing the whole series of sieves to descend on to acarriage 61 provided therebeneath, it is only necessary to attach theropes to the hooks, to remove the different connections and then topermit the handle 62 to turn, the retaining pawl having been disengaged.The sieves may be easily mounted in position by the same but reversedoperations.

If it is only desired to sift the material through a single size ofmesh, sieves l having screens of the same mesh size may be usedaccording to the arrangement'shown in Fig. 6. v In this case, the outputof the machine is consequently amplified in proportion to the number 'ofsieves. The material may then be fed to the upper sieve by the abovedescribed device and tothe sieves under the upper one by a feedingdevice 67 (Figs. Gand 7) in which a drum 68 rotates, said drum having alongitudinal slot 69. The material coming into said slot is distributedto a series of hose pipes 70 connected to pipes 71 which end above eachsieve. In this case, each sieve has in its center a small recessed disk72 above which is located the delivery end of a collecting hop er 73which receives all the material alling through the .sieve located above.The sifted material thus descends in the form of a central streamthrough the machine while the refuse is ejected through lateral s outs74l be used in combination, some of the sieves being arranged as in thefirst case and the remainder being arranged as described in the lattercase. If the material to be sifted contains for instance a considerableamount of grains of a certain size, several screens of the same meshcorresponding to said grain size will be superpo-sed so that the machinehas a large output for such size of grains while a number of sieves of adifferent mesh will be arranged to sift the grains of other sizes, theoperation of the machine being the same with any number of sieves. Mymachine has consequently a great flexibility of operation so that it maybe readily adapted to all cases happening in practice. The materialwhile being sifted is therefore submitted to a curvilinear movementcorresponding substantially to an ellipse under the action of the crankshaft 25 and connecting rods 28 and 31. The material is also preventedto engage into the meshes by the shocks imparted to the sieves by cams17, the extent of said shaking movement being controlled or nulliied bymeans of the adjustable stops 23 when no shocks are required as forinstance for flour. The material fed by the feeding device 36 on to thefirst sieve along a horizontal radius thereof is immediately spread byone of the brushes on an upward movement whereby the spreading of thematerial in a uniformly thin layer is considerably facilitated. Thebrushes are also adapted to keep the screens clean, which isindispensable for a good sifting.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent is:

l. In a sieving machine: in combination, circular superposed sieves, afeeding mechanism, a driving shaft, a crank shaft operated thereby, anadjustable rod connected to the crank shaft, a vertical rod on thesieves at a point near the crank shaft and connected to the connectingrod at a point near the top of the superposed sieves, a forked rodconnected to the crank shaft and to the lower sieve along a diameter atright angles with the plane passing throu h the axis of the sieves andthe crank sha a rod connecting a point of the lower sieve remote fromthe crank shaft to the frame, means for impart ing to said sieves avertical shaking movement, and rotat-able brushes for automaticallyspreading the material on the sieves, substantially as set forth. Y

2. In a sieving machine, in combination: a frame, circular superposedsieves, a feeding mechanism, means for imparting to the sieves acurvilinear movement, vertical rods supporting the sieves, oscillatinglevers connected to said rods, a driving shaft, cams on said shaftactuating the oscillating levers, buffer springs on the frame for theoscillating levers, adjustable stops on said frame for the levers, androtatable brushes for automatically spreading the material on thesieves,'substantially as set forth.

3. In a sieving machine, in combination, a frame, a feeding mechanism,means for imparting to the sieves a curvilinear movement, means forimparting to the sieves a vertical shaking movement, rotatable brushesin frictional contact with the material on the sieves, elastic armscarrying said brushes, a vertil cal shaft to which the arms are secured,a ratchet on said shaft, a pawl cooperating with said ratchet, anormally fixed arm supporting the pawl and means connected to said armfor signaling any disorder in the operation of the brushes.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JOSEPH BERNARD LOISON.

Witnesses: l

ANTOINE LAvoIX, l H. C. COXE.

Copies of this patent may be obtained. for iive cents each, byaddressing the Commissioner of Patents.

Washington, D. C.

